3-Methylbenzo[b]thiophene-2-carboxylic acid is an important heterocyclic carboxylic acid widely used in pharmaceutical synthesis, particularly as a building block for antitumor and anti-inflammatory agents. It features a melting point of 241-244°C (lit.) and predicted boiling point of 379.9±22.0°C at 760 mmHg. The compound has a density of 1.355 g/cm³ and is practically insoluble in water but soluble in organic solvents like ethanol and DMF. Storage should be in sealed containers at room temperature, protected from light and moisture. Safety precautions include wearing gloves and eye protection due to potential skin/eye irritation (GHS Category 2).
